Summary of Significant Accounting Policies - Income Taxes (Details) $ in Millions |
12 Months Ended |
|---|---|
|
Dec. 31, 2017
USD ($)
| |
| Accounting Policies [Abstract] | |
| Total effect of income tax reform | $ 31.0 |
| Unrecognized tax benefits | $ 0.0 |
| X | ||||||||||
- Definition Tax Cuts and Jobs Act of 2017, Income Tax Expense (Benefit) No definition available.
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition Amount of unrecognized tax benefits. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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